Barrier-First Skincare: Why the Health of Your Skin Barrier Determines How Well Every Active Works
What the Skin Barrier Actually Is The skin barrier, more precisely called the stratum corneum, is the outermost layer of the epidermis. It is made up of flattened, dead skin cells held together by a matrix of lipids, primarily ceramides, fatty acids, and cholesterol. The analogy most frequently used is bricks and mortar: the cells are the bricks, and the […]